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"""Send e-mail notification to system administrators."""
import email
import smtplib
import socket
import subprocess
def notify(subject, whom, what):
"""Send email notification.
Try to notify the addressee (``whom``) by e-mail, with Subject:
defined by ``subject`` and message body by ``what``.
"""
msg = email.message_from_string(what)
msg.add_header("From", "Certbot renewal agent <root>")
msg.add_header("To", whom)
msg.add_header("Subject", subject)
msg = msg.as_string()
try:
lmtp = smtplib.LMTP()
lmtp.connect()
lmtp.sendmail("root", [whom], msg)
except (smtplib.SMTPHeloError, smtplib.SMTPRecipientsRefused,
smtplib.SMTPSenderRefused, smtplib.SMTPDataError, socket.error):
# We should try using /usr/sbin/sendmail in this case
try:
proc = subprocess.Popen(["/usr/sbin/sendmail", "-t"],
stdin=subprocess.PIPE)
proc.communicate(msg)
except OSError:
return False
return True
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